What's so special about the string "stdout"? I would have thought such thing should be a System` symbol.
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qazwsxApr 22 '12 at 1:41

Another question is is there a solution using Print[] instead of WriteString[]?
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qazwsxApr 22 '12 at 1:43

+1. As I understand, "printing" in such a way is only possible in the plaintext format?
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Alexey PopkovApr 22 '12 at 1:46

@AlexeyPopkov Yep. From the help: The special stream "stdout" allows you to give output to the "standard output" provided by the operating system. Note however that you can use this stream only with simple text-based interfaces to Mathematica.
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belisariusApr 22 '12 at 2:53

@MaThEmAtika Print[] is a special case of CellPrint[], which creates a new cell upon each call. I can't find a way to prevent that happening.
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belisariusApr 22 '12 at 3:20

I tried belisarius' answer using WriteString, but it just prints plain text, and you can't print, for example x2. Instead you have to print x^2 which is not cool for reading.

I found a way using Google and Mathematica's help. The main thing I was missing was that under each command found in the help of Mathematica you have "More Information" image which if clicked shows more info about the command. For the Print command, it says that Print uses the Row which is what I use for my solution.

The idea is to create a list. We can do it for example with the command myArray = Range[2];. Then instead of printing what we want to print we will add it in the list myArray[[1]] = "First thing to print";. When we are ready and want to print all we just call the Row[myArray] command which will concatenate the elements of the list and print them with a newline at the end of the concatenated elements.

Here is your solution:

myArray = Range[2];
myArray[[1]] = "first part of the result " DateString[];
myArray[[2]] = " addition to the result " DateString[];
Row[myArray]

Instead of multiplying two strings, you should probably Join them. In infix notation this would be "first part"<>DateString[]. Also, if I understand correctly, the OP wants to use the print statements in two different locations in the code, so this won't help. It might come in handy in other situations though!
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sebhoferApr 29 '12 at 9:38

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